WO1998008267A1 - Flexible telescoping antenna and method of constructing the same - Google Patents

Flexible telescoping antenna and method of constructing the same Download PDF

Info

Publication number
WO1998008267A1
WO1998008267A1 PCT/US1997/014505 US9714505W WO9808267A1 WO 1998008267 A1 WO1998008267 A1 WO 1998008267A1 US 9714505 W US9714505 W US 9714505W WO 9808267 A1 WO9808267 A1 WO 9808267A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular section
antenna
section
antenna according
conducting
Prior art date
Application number
PCT/US1997/014505
Other languages
French (fr)
Inventor
Craig Phelps
Gerard Hayes
Original Assignee
Ericsson Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc. filed Critical Ericsson Inc.
Priority to AU41525/97A priority Critical patent/AU4152597A/en
Publication of WO1998008267A1 publication Critical patent/WO1998008267A1/en
Priority to SE9900533A priority patent/SE9900533L/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/10—Telescopic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path

Definitions

  • the present invention relates to mobile phones and like communication devices and, in particular, to a flexible telescoping antenna for such devices and a method of manufacturing the same.
  • a large antenna improves radiation performance.
  • Many hand-held transceivers incorporate retracting antennas wherein increased performance can be obtained by extending the antenna to its maximum elongation. In this regard, when the increased performance is not required, the antenna may be retracted into a stowed position that occupies less volume.
  • retractable antennas consist of two primary types: a telescoping series of metallic, concentric cylinders that are reducible into the largest cylinder, and a simple rod that retracts into the housing of the transceiver.
  • a simple rod retractable antenna size constraints of the telecommunications equipment mechanical housing often prohibit the use of a simple retractable antenna.
  • telescoping antennas are rigid metallic cylinders that are prone to permanent bending. Once bent, the cylinders lose their concentricity, and the process of retracting the antenna becomes increasingly difficult and often results in breakage.
  • electrical performance is severely degraded in the stowed position. If the extended length of the antenna is a minimum resonant length, the shorter stowed position will be non-resonant and therefore less efficient for radiation.
  • a flexible telescoping antenna including an end section formed of a conducting material, a tubular section formed of a non-conducting material that slidably receives the end section, and a conducting insert disposed in the tubular section in electrical contact with the end section.
  • the end section is preferably slidable through an opening in the tubular section.
  • the antenna further includes an end cap secured to an end of the end section that is formed of a conducting material and has a width that is greater than a diameter of the opening.
  • the conducting insert is in electrical contact with the end cap.
  • the conducting insert is disposed in the tubular section radially offset from a central axis of the tubular section or against a wall of the tubular section.
  • the electrical contact may be galvanic contact or may be achieved with a capacitive coupling.
  • At least one subsequent tubular section formed of a non-conducting material may be provided slidably receiving the tubular section or other subsequent tubular sections.
  • a compact antenna which may comprise a plastic coated helix coil, may be provided securable to an apparatus requiring the antenna and having a tubular section therethrough that slidably supports the tubular section.
  • the conducting insert includes an end plug at a distal end thereof that has a first section with a reduced width substantially corresponding to a diameter of the tubular section and a second section with a width greater than the diameter of the tubular section.
  • the end plug may have a stop cap secured thereto that is formed of a conducting material and has a width that is greater than the diameter of the tubular section.
  • the end plug of the conducting insert is in electrical contact with the stop cap.
  • a method of constructing the flexible telescoping antenna noted above.
  • the method includes the steps of (a) inserting the end section into the opening in the tubular section, (b) securing the end cap having a width greater than the opening to an end of the end section inside the tubular section, and (c) securing the conducting insert inside the tubular section in electrical contact with the end cap.
  • the tubular section is inserted into the compact antenna in a friction fit such that the compact antenna supports the tubular section and the end section to an apparatus requiring the antenna.
  • the method may further include securing the tubular section to a subsequent tubular section.
  • Step (c) may be practiced by securing the conducting insert inside the tubular section radially offset from a central axis of the tubular section.
  • FIGURE 1 is an elevation view of the flexible telescoping antenna according to the present invention.
  • FIGURE 2 is a cross-sectional view of the antenna illustrated in FIGURE 1.
  • the antenna includes an end section 10 that is formed of a conductive material such as nickel titanium and is plastic coated.
  • the end section 10 is slidably received in a tubular section 12, which is formed of a non-conducting material such as plastic.
  • the end section 10 is inserted into the tubular section 12 through an opening 12a in the tubular section 12.
  • An end cap 14 having a width that is greater than a diameter of the opening 12a is press fit or otherwise secured on the end section 10 to prevent the end section from being separated from the tubular section 12.
  • the end cap 14 is formed of an electrically conducting material and is in electrical contact with the end section 10.
  • a conducting insert 16 is inserted in the tubular section 12 and extends substantially along the entire length of the tubular section 12.
  • the conducting insert 16 includes an end plug 18 having a first section 18a with a reduced width substantially corresponding to the inside diameter of the tubular section 12 and a second section 18b having a width that is greater than the diameter of the tubular section 12.
  • the end plug 18 includes only the section 18a, and the enlarged section 18b is rather a stop cap secured to the end plug 18.
  • the stop cap 18b is formed of a conducting material and is in electrical contact with the end plug 18 of the conducting insert 16.
  • the conducting insert 16 is formed of a thin conducting material such as nickel titanium such that the insert is disposed in the tubular section 12 radially offset from a central axis of the tubular section.
  • the conducting insert is disposed against an inside wall of the tubular section 12.
  • the end cap 14 maintains its electrical contact with the conducting insert 16 at any interval of extraction of the antenna. That is, the conducting insert is sandwiched between the end cap 14 and the inside wall of the tubular section 12. Thus, as the end section 10 is retracted, the end cap 14 maintains electrical contact with the conducting insert 16.
  • a compact antenna 20 that is attachable to a mobile communications device or the like includes a central channel 22 that receives the tubular section 12 in a friction fit.
  • the compact antenna 20 thus supports the antenna structure.
  • the compact antenna includes a plastic coated helix coil which is in electrical contact with the end plug 18 of the conducting insert 16.
  • the communications device is functional when the antenna is completely retracted.
  • the compact antenna 20 is attachable to the mobile communications device in any suitable manner, such as screw threads or a press fit over section 20a.
  • the electrical contact of the antenna conducting materials is preferably galvanic contact: however, by adding a thin dielectric spacing, the electrical contact can be achieved with a capacitive coupling.
  • FIGURES illustrate a single tubular section 12 between the end section 10 and the compact antenna 20, those of ordinary skill in the art will appreciate that subsequent tubular sections could be provided.
  • each tubular section would include a similar conducting insert and a press fit cap or end plug similar to end cap 14.
  • the flexible telescoping antenna according to the invention utilizes plastic telescoping sections and conducting elements of solid small diameter flexible metal rods (or helices).
  • the antenna is thus less susceptible to breakage allowing maximum mechanical deflection of the telescoping sections without permanent deformation of the antenna while providing optimum electrical performance.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

A flexible telescoping antenna is constructed of plastic tubular sections (12) telescoping between an end section (10) and a compact antenna (20). Conducting inserts (16) are provided within the tubular sections (12) and enable electrical contact at any extraction interval of the antenna. The antenna utilizing plastic telescoping sections allows maximum mecanical deflection and thereby resists breakage while providing optimum electrical performance.

Description

FLEXIBLE TELESCOPING ANTENNA AND METHOD OF CONSTRUCTING THE SAME
BACKGROUND OF THE INVENTION
The present invention relates to mobile phones and like communication devices and, in particular, to a flexible telescoping antenna for such devices and a method of manufacturing the same.
With mobile communication devices and the like, a large antenna improves radiation performance. Many hand-held transceivers incorporate retracting antennas wherein increased performance can be obtained by extending the antenna to its maximum elongation. In this regard, when the increased performance is not required, the antenna may be retracted into a stowed position that occupies less volume.
Typically, retractable antennas consist of two primary types: a telescoping series of metallic, concentric cylinders that are reducible into the largest cylinder, and a simple rod that retracts into the housing of the transceiver. With respect to a simple rod retractable antenna, size constraints of the telecommunications equipment mechanical housing often prohibit the use of a simple retractable antenna. Conventionally, telescoping antennas are rigid metallic cylinders that are prone to permanent bending. Once bent, the cylinders lose their concentricity, and the process of retracting the antenna becomes increasingly difficult and often results in breakage. Furthermore, since telescoping antenna designs retract into a base metallic cylinder, electrical performance is severely degraded in the stowed position. If the extended length of the antenna is a minimum resonant length, the shorter stowed position will be non-resonant and therefore less efficient for radiation.
SUMMARY OF THE INVENTION It is therefore an object of the invention to provide an antenna that overcomes the drawbacks associated with conventional antennas. In this regard, it is another object of the invention to provide a flexible telescoping antenna that provides optimum electrical performance and maximum mechanical deflection of telescoping sections without permanent deformation of the antenna. It is another object of the invention to enhance antenna performance at any antenna extraction interval including the stowed position.
These and other objects of the invention are achieved by providing a flexible telescoping antenna including an end section formed of a conducting material, a tubular section formed of a non-conducting material that slidably receives the end section, and a conducting insert disposed in the tubular section in electrical contact with the end section. The end section is preferably slidable through an opening in the tubular section. In this regard, the antenna further includes an end cap secured to an end of the end section that is formed of a conducting material and has a width that is greater than a diameter of the opening. The conducting insert is in electrical contact with the end cap. In a preferred arrangement, the conducting insert is disposed in the tubular section radially offset from a central axis of the tubular section or against a wall of the tubular section. The electrical contact may be galvanic contact or may be achieved with a capacitive coupling. At least one subsequent tubular section formed of a non-conducting material may be provided slidably receiving the tubular section or other subsequent tubular sections. In addition, a compact antenna, which may comprise a plastic coated helix coil, may be provided securable to an apparatus requiring the antenna and having a tubular section therethrough that slidably supports the tubular section. In this regard, the conducting insert includes an end plug at a distal end thereof that has a first section with a reduced width substantially corresponding to a diameter of the tubular section and a second section with a width greater than the diameter of the tubular section. Alternatively, the end plug may have a stop cap secured thereto that is formed of a conducting material and has a width that is greater than the diameter of the tubular section. In this context, the end plug of the conducting insert is in electrical contact with the stop cap.
In accordance with another aspect of the invention, there is provided a method of constructing the flexible telescoping antenna noted above. The method includes the steps of (a) inserting the end section into the opening in the tubular section, (b) securing the end cap having a width greater than the opening to an end of the end section inside the tubular section, and (c) securing the conducting insert inside the tubular section in electrical contact with the end cap. The tubular section is inserted into the compact antenna in a friction fit such that the compact antenna supports the tubular section and the end section to an apparatus requiring the antenna. The method may further include securing the tubular section to a subsequent tubular section. Step (c) may be practiced by securing the conducting insert inside the tubular section radially offset from a central axis of the tubular section. BRIEF DESCRIPTION OF THE DRAWINGS
These and further aspects and advantages of the present invention will be described in detail with reference to the accompanying drawings, in which:
FIGURE 1 is an elevation view of the flexible telescoping antenna according to the present invention: and
FIGURE 2 is a cross-sectional view of the antenna illustrated in FIGURE 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to FIGURES 1 and 2, the assembly of the flexible telescoping antenna according to the present invention is illustrated. The antenna includes an end section 10 that is formed of a conductive material such as nickel titanium and is plastic coated. The end section 10 is slidably received in a tubular section 12, which is formed of a non-conducting material such as plastic. The end section 10 is inserted into the tubular section 12 through an opening 12a in the tubular section 12. An end cap 14 having a width that is greater than a diameter of the opening 12a is press fit or otherwise secured on the end section 10 to prevent the end section from being separated from the tubular section 12. The end cap 14 is formed of an electrically conducting material and is in electrical contact with the end section 10.
A conducting insert 16 is inserted in the tubular section 12 and extends substantially along the entire length of the tubular section 12. At its distal end, the conducting insert 16 includes an end plug 18 having a first section 18a with a reduced width substantially corresponding to the inside diameter of the tubular section 12 and a second section 18b having a width that is greater than the diameter of the tubular section 12. In an alternative configuration, the end plug 18 includes only the section 18a, and the enlarged section 18b is rather a stop cap secured to the end plug 18. In this regard, the stop cap 18b is formed of a conducting material and is in electrical contact with the end plug 18 of the conducting insert 16.
Referring to FIGURE 2, the conducting insert 16 is formed of a thin conducting material such as nickel titanium such that the insert is disposed in the tubular section 12 radially offset from a central axis of the tubular section.
Preferably, the conducting insert is disposed against an inside wall of the tubular section 12. By virtue of this arrangement, the end cap 14 maintains its electrical contact with the conducting insert 16 at any interval of extraction of the antenna. That is, the conducting insert is sandwiched between the end cap 14 and the inside wall of the tubular section 12. Thus, as the end section 10 is retracted, the end cap 14 maintains electrical contact with the conducting insert 16.
A compact antenna 20 that is attachable to a mobile communications device or the like includes a central channel 22 that receives the tubular section 12 in a friction fit. The compact antenna 20 thus supports the antenna structure. In one arrangement, the compact antenna includes a plastic coated helix coil which is in electrical contact with the end plug 18 of the conducting insert 16. When the compact antenna 20 includes the helix coil, the communications device is functional when the antenna is completely retracted. The compact antenna 20 is attachable to the mobile communications device in any suitable manner, such as screw threads or a press fit over section 20a. As shown in FIGURE 2. the electrical contact of the antenna conducting materials is preferably galvanic contact: however, by adding a thin dielectric spacing, the electrical contact can be achieved with a capacitive coupling. In addition, although the FIGURES illustrate a single tubular section 12 between the end section 10 and the compact antenna 20, those of ordinary skill in the art will appreciate that subsequent tubular sections could be provided. In this regard, each tubular section would include a similar conducting insert and a press fit cap or end plug similar to end cap 14.
The flexible telescoping antenna according to the invention utilizes plastic telescoping sections and conducting elements of solid small diameter flexible metal rods (or helices). The antenna is thus less susceptible to breakage allowing maximum mechanical deflection of the telescoping sections without permanent deformation of the antenna while providing optimum electrical performance.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A flexible telescoping antenna comprising: an end section formed of a conducting material; a tubular section formed of a non-conducting material, said tubular section slidably receiving said end section; and a conducting insert disposed in said tubular section in electrical contact with said end section.
2. An antenna according to claim 1, wherein said end section is slidable through an opening in said tubular section, the antenna further comprising an end cap secured to an end of said end section, said end cap being formed of a conducting material and having a width that is greater than a diameter of said opening, wherein said conducting insert is in electrical contact with said end cap.
3. An antenna according to claim 2, wherein said conducting insert is disposed in said tubular section radially offset from a central axis of said tubular section.
4. An antenna according to claim 3, wherein said conducting insert is disposed against a wall of said tubular section.
5. An antenna according to claim 2, wherein said electrical contact is galvanic contact.
6. An antenna according to claim 2, wherein said electrical contact is achieved with a capacitive coupling.
7. An antenna according to claim 2, further comprising at least one subsequent tubular section formed of a non-conducting material, said at least one subsequent tubular section slidably receiving one of said tubular section and other subsequent tubular sections.
8. An antenna according to claim 2, further comprising a compact antenna securable to an apparatus requiring the antenna and having a channel therethrough, said tubular section being slidably supported in said channel.
9. An antenna according to claim 8, wherein said conducting insert comprises an end plug at a distal end thereof, said end plug including a first section having a reduced width substantially corresponding to a diameter of said tubular section and a second section having a width greater than the diameter of said tubular section.
10. An antenna according to claim 8, wherein said conducting insert comprises an end plug at a distal end thereof, said end plug having a width substantially corresponding to a diameter of said tubular section, the antenna further comprising a stop cap secured to said end plug, said stop cap being formed of a conducting material and having a width that is greater than the diameter of said tubular section, wherein said end plug of said conducting insert is in electrical contact with said stop cap.
11. An antenna according to claim 8, wherein said compact antenna comprises a plastic coated helix coil.
12. An antenna according to claim 1, further comprising a compact antenna securable to an apparatus requiring the antenna and having a channel therethrough, said tubular section being slidably supported in said channel.
13. An antenna according to claim 12, wherein said conducting insert comprises an end plug at a distal end thereof, said end plug including a first section having a reduced width substantially corresponding to a diameter of said tubular section and a second section having a width greater than the diameter of said tubular section.
14. An antenna according to claim 12, wherein said conducting insert comprises an end plug at a distal end thereof, said end plug having a width substantially corresponding to a diameter of said tubular section, the antenna further comprising a stop cap secured to said end plug, said stop cap being formed of a conducting material and having a width that is greater than the diameter of said tubular section, wherein said end plug of said conducting insert is in electrical contact with said stop cap.
15. An antenna according to claim 14, wherein said non-conducting material is plastic.
16. An antenna according to claim 1 , wherein said end section is coated with a non-conducting material.
17. An antenna according to claim 1 , wherein said non-conducting material is plastic.
18. An antenna according to claim 1 , wherein said electrical contact is galvanic contact.
19. An antenna according to claim 1 , wherein said electrical contact is achieved with a capacitive coupling.
20. A method of constructing a flexible telescoping antenna including an end section formed of a conducting material, a tubular section formed of a nonconducting material, and a conducting insert disposed in the tubular section in electrical contact with the end section, the method comprising:
(a) inserting the end section into an opening in the tubular section;
(b) securing an end cap having a width greater than the opening to an end of the end section inside the tubular section; and
(c) securing the conducting insert inside the tubular section in electrical contact with the end cap.
21. A method according to claim 20, further comprising inserting the tubular section into a compact antenna in a friction fit, the compact antenna supporting the tubular section and the end section to an apparatus requiring the antenna.
22. A method according to claim 20, further comprising securing the tubular section to a subsequent tubular section.
23. A method according to claim 20, wherein step (c) is practiced by securing the conducting insert inside the tubular section radially offset from a central axis of the tubular section.
PCT/US1997/014505 1996-08-21 1997-08-19 Flexible telescoping antenna and method of constructing the same WO1998008267A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU41525/97A AU4152597A (en) 1996-08-21 1997-08-19 Flexible telescoping antenna and method of constructing the same
SE9900533A SE9900533L (en) 1996-08-21 1999-02-17 Flexible telescoping antenna and process for its manufacture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/701,126 1996-08-21
US08/701,126 US5900846A (en) 1996-08-21 1996-08-21 Flexible telescoping antenna and method of constructing the same

Publications (1)

Publication Number Publication Date
WO1998008267A1 true WO1998008267A1 (en) 1998-02-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/014505 WO1998008267A1 (en) 1996-08-21 1997-08-19 Flexible telescoping antenna and method of constructing the same

Country Status (4)

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US (1) US5900846A (en)
AU (1) AU4152597A (en)
SE (1) SE9900533L (en)
WO (1) WO1998008267A1 (en)

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US6034639A (en) * 1997-12-22 2000-03-07 T & M Antennas Retractable antenna for portable communicator
JP2000004112A (en) * 1998-06-15 2000-01-07 Matsushita Electric Ind Co Ltd Antenna
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US7298610B2 (en) * 2003-08-01 2007-11-20 Lg Electronics Inc. Supporting apparatus for portable computer
US8284109B2 (en) * 2007-10-31 2012-10-09 Lockheed Martin Corporation Telescoping radar array
DE102009004024A1 (en) * 2008-10-30 2010-05-06 Rohde & Schwarz Gmbh & Co. Kg Portable dual band antenna

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Also Published As

Publication number Publication date
SE9900533D0 (en) 1999-02-17
SE9900533L (en) 1999-04-21
US5900846A (en) 1999-05-04
AU4152597A (en) 1998-03-06

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